Konica Corporation

Konica Minolta, Inc.

Konica Minolta Business Technologies, Inc.

Kishio Tamura

Daisuke Watanabe

Masafumi Uchida

Koji Shibata

Hiroaki Obata

Anju Hori

Natsuko Fujisaki

Tomomi Oshiba

Mayumi Hayashi

Tsuneo Daidoji

Hiroshi Yamazaki

Kenji Yamane

Ken Ohmura

Meizo Shirose

Kenichi Onaka

Ito Koga

Saburou Hiraoka

Hitomi Motani

Yuji Marukawa

Takumi Ishiwata

Yuya Kubo

Sayuri Nakano

Mayumi Tanaka

A color tone quantification device for a glossy color, in which the correlation with the color tone of the glossy color visually perceived by humans is further enhanced, is provided. The device comprises a coefficient calculation unit that calculates a coefficient calculated in consideration of a spatial distribution which is to be used to correct the chromaticity measured by a method including a specular reflection component obtained by measuring the reflection light obtained by reflection of measurement light to an area of an object; a chromaticity calculation unit that calculates an effective chromaticity obtained by weighting the chromaticity measured by the method including the specular reflection component with the coefficient calculated by the coefficient calculation unit; and an output unit that outputs the effective chromaticity as a stimulus value representing a glossy color of the area in a color space.

Color tone quantification device for glossy color, color tone measurement device for glossy color and color tone quantification method for glossy color

The present invention provides a means for suppressing an occurrence of a ghost by enhancing diffraction efficiency of a holographic optical element having a volume hologram recording layer. The present invention is a holographic optical element including: a volume hologram recording layer containing a photopolymer; and at least one adjacent layer which is in contact with the volume hologram recording layer and contains a resin, wherein a diffraction grating is formed so as to extend from the volume hologram recording layer to the adjacent layer.

Holographic optical element and method for producing the same

To provide a fixing solution and an image forming method in which faster fixing rate and faster drying rate can be achieved while the amount of fixing solution supplied is reduced and furthermore, a wet feeling in a formed image is reduced and an image having a high fixing strength can be formed. A fixing solution that softens a toner to fix a toner image constituted by the toner to an image support contains a hydroxyl group-containing ester compound expressed by general formula (1) below:R&#x2014;(CO)&#x2014;O&#x2014;R&#x2003;&#x2003;general formula (1):where Rrepresents a linear or branched alkyl group having 6 to 11 carbon atoms, and Rrepresents a linear or branched alkyl group having at least one hydroxyl group and 2 to 4 carbon atoms.

Fixing solution and image forming method

Disclosed are a toner for electrostatic image development and an image formation process using the same which can achieve high varnish application property and high adhesion of a heat-fixed image to a varnish layer even when the varnish layer is formed on the fixed image formed by an image formation process of an electrophotographic system. The toner for electrostatic image development includes toner particles containing at least a binder resin, a colorant and a parting agent, and the binder resin contains a polyfunctional acrylate-modified polyester resin obtained by modification with a polyfunctional acrylate compound. In the toner for electrostatic image development, it is preferable that the toner particles have a core-shell structure, in which the surface of a core particle is coated with a shell layer, and the polyfunctional acrylate-modified polyester resin is contained in the shell layer.

Toner for electrostatic image development, two-component developer, and image formation process

In an image forming method of wet fixing system, the fixing solution contains an ester compound represented by at least one of general formula (1) and general formula (2) below:R&#x2014;(CO)&#x2014;O&#x2014;R&#x2003;&#x2003;General formula (1):

Image forming method

An image forming method that can obtain a high fixing strength and reduce the occurrence of a document offset phenomenon is provided. In the image forming method the polyester resin forming the binder resin of the toner is obtained by condensing and polymerizing a carboxylic component containing at least one compound selected from chemical formula (1), (2) and (3) shown below that is an addition reactant of abietic acid and a carboxylic compound having an unsaturated double bond and an alcohol component, and the content of at least the one compound selected from the chemical formula (1), (2) and (3) in the carboxylic component is 5% by mass or more, and the fixing agent contains an alkylene carbonate which may have a substituent group or an aliphatic alkyl carboxylic acid ester which may have a substituent group. 

An image forming method wherein a storage container, accommodating the toner having a volume-based median diameter of 3.5 &#x3bc;m through 8.5 &#x3bc;m and containing a resin having a glass-transition temperature of 0&#xb0; C. through 46&#xb0; C. and a softening point of 75&#xb0; C. through 110&#xb0; C., is included in an packaging container made of a substance having an apparent density of 0.1 through 0.3; and a toner supply section constituting the storage container is exposed to the outside from the packaging container, and is loaded on the image forming apparatus, whereby toner is supplied to the image forming apparatus.

Electrophotographic image forming method using a double walled toner cartridge

An electrophotographic toner is disclosed. The toner contains resinous composition comprising a lower molecular weight component having peak at molecular weight of 3,000 to 50,000 and a higher weight having peak at molecular weight of 100,000 to 5,000,000 of the copolymer comprised of vinyl based copolymer comprised of styrene based monomer and acrylic or methacrylic acid ester based monomer as structural units, and a fatty acid ester specified in the specification and a carboxylic acid specified in the specification.

Electrophotographic toner, and image forming apparatus and image forming method using the same

Disclosed is a developer for developing an electrostatic latent image, comprising:

Two component type developer for electrostatic latent image

Disclosed is a developer of electrostatic latent image containing a carrier and a toner which contains a colorant and a binder resin, wherein the carrier comprises a magnetic substance particle and a resin coated on the magnetic substance particle, and said resin for coating is a polyolefin having a weight average molecular weight (Mw) of 20.times.10.sup.4 to 100.times.10.sup.4, a number average molecular weight (Mn) of 0.5.times.10.sup.4 to 10.times.10.sup.4 and an Mw/Mn of 5 to 100; and further the toner may contain a polyolefin having a number average molecular weight of 1500 to 9000 as a releasing agent.

Developer for electrostatic latent image development

Disclosed is a two-component developer for developing a electrostatic image comprising a toner particle and a carrier particle comprising a substantially spherical magnetic particle coated with a resin, wherein said substantially spherical magnetic particle contains a compound comprising silicon element in an amount of 100 ppm to 5000 ppm based on said substantially spherical magnetic particle.

Two-component type developer for developing an electrostatic image

A carrier for electrophotographic use is disclosed. The carrier has a resin-coated layer on the surface of the core member. The resin forming the coated layer contains a polymer prepared by copolymerizing an alicyclic methacrylate monomer and a chain-type methacrylate monomer. A high quality image can stably be obtained extending over a long period of time when the carrier is used in continuous developing.

Carrier for electrophotographic use

A method for preparing a carrier for developing an electrostatic charge image, wherein the carrier comprises core particles each having thereon a resin coated layer, and a volume base average particle diameter D50 of the core particles is within the range of 40 to 80 .mu.m, and 5 wt % or less of the core particles have a volume base average particle diameter D50.times.1.2 .mu.m or more and 5 wt % or less of the core particles have a volume base average particle diameter D50.times.0.7 .mu.m or less, comprising the steps of forming a mixture of the core particles and coagulated resin particles; applying an impact force repeatedly to said mixture to coat said coagulated resin particles on said core particles; wherein a volume base average particle diameter D50 of the coagulated resin particles is within the range of 0.5 to 20 .mu.m, and a ratio of a volume base 25% particle diameter of the coagulated resin particles/a volume base average particle diameter D50 of the coagulated resin particles is within the range of 0.5 to 1.0, and a ratio of a volume base 75% particle diameter of the coagulated resin particles/a volume base average particle diameter D50 of the coagulated resin particles is within the range of 1.0 to 1.8.

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Tokyo, Japan

Kishio Tamura